Sheet material winding machines



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SHEET MATERIAL WINDING MACHINES 5 Sheets-Sheet 5 INVENTOR A T6%S mun. PIWSLCIYK Feb. 10, 1970 Filed July so, 1968 \VNNZ \\y l 2%; E 2 I I E %/Z/I III United States Patent 3,494,566 SHEET MATERIAL WINDING MACHINES Werner Pawelczyk, Misburg, Germany, assignor to Hermann Machinenbau G.m.b.H., Hannover, Germany, a joint-stock company of Germany Filed July 30, 1968, Ser. No. 748,769 Claims priority, application Germany, Aug. 2, 1967,

4,307 Int. Cl. B65h 19/20, 75/02 US. Cl. 242-56 12 Claims ABSTRACT OF THE DISCLOSURE A sheet material winding machine includes a guide drum coaxial with a pair of swing levers each carrying a bracket at the free ends thereof. In one position of the brackets a core is received from a magazine, in an- Other a completed roll is cut either obliquely or in a straight line dependent upon whether the levers remain stationary with respect to the drum or move relatively thereto.

BACKGROUND OF THE INVENTION Field of the invention The invention relates to a machine for continuously winding foil or other sheet material onto cores.

Description of the prior art One previously proposed machine of this kind has a star-type winder and a swing lever, which, on completion of winding, grips the foil or other sheet material and cuts it off. The star-type winder is then swung into the winding position with an empty core and the winding action is repeated. The disadvantage of this is that the foil hangs free in space during the change-over, that is to say is unsupported from below, so that it is impossible, mainly in the case of thin foils, to apply the foil to the empty core without the formation of creases.

SUMMARY OF THE INVENTION According to the present invention there is provided in a machine for continuously winding sheet material onto a core, a core magazine, a cutting head for cutting the sheet material, and means for discharging a wound core from the machine, the improvement comprising means defining a guide drum around which sheet material to be wound is passed, a pair of swing levers co-axial with the guide drum and each carrying bracket means for supporting the core, means for moving the swing levers selectively either with the guide drum or separately between positions at which a core is received from the core magazine, a position at which the cutting head comes into operation to cut the sheet material and a. position at which winding can take place, said cutting head being carried by said swing levers.

Another feature in accordance with the invention, in the case of swing levers that can be moved jointly with the guide drum, is the provision of an electromagnetic coupling for linking the swing levers to the guide drum.

For a machine in which the swing levers move independently of the guide drum, on the other hand, they are connected to a hydraulic motor.

. According to a further feature in accordance with the invention, each of the brackets for holding the cores includes a forked member, one prong of which can be moved, preferably by a hydraulic ram, in a direction parallel to the other prong. The arrangement is such that, when the moving prong of the fork is moved one way, the core is deposited, while in the magazine-discharge position, is brought to bear against the guide drum in 3,494,566 Patented Feb. 10, 1970 such a way that, following the cutting action, the core is partially wound.

The two swing levers serve to move the partially wound roll from the magazine-discharge position to the winding position.

A roll mounting means should preferably be provided with a catch, which is released prior to the partially wound roll being taken over and before the roll is discharged into the storage container or the like. This roll mounting means is driven by a double-acting ram, which presses the roll against the guide drum and moves the roll mounting to the discharge position or winding position as the case may be.

The cutting head should preferably consist of a cutter carriage which is moved by a screwthread drive and returned to its starting position after completing a cut.

The core magazine is pivoted and is swung upwards out of action after a core has been deposited in the holding brackets.

BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a general side view, partly in section, of a machine in accordance with the invention;

FIGURE 2 is an elevation of a guide drum forming a part of the machine, shown partly in section;

FIGURE 3 is a side elevation of the part of the machine shown in FIGURE 2;

FIGURE 4 is a view which shows a roll mounting means of the machine;

FIGURE 5 is a section along the line VV in FIG- URE 4;

FIGURE 6 is a section, to an enlarged scale, of a cutting head of the machine, a cutter carriage of the head being omitted in the interest of clarity; and

FIGURE 7 is a view which shows the carriage of the cutting head, partly in section.

A run of foil 1 coming from a calendar (not shown) is taken around a stretcher bar 2 alongside a guide drum 3 (FIGURE 1).

As can be seen from FIGURE 2, the guide drum 3 is fast with a gearwheel 4 in mesh with a driving pinion (not shown). The guide drum 3 is journalled in roller bearings 5, on a shaft 6, to which rotary motion can be imparted by a hydraulic motor 7.

A pair of swing levers 8, rigidly fixed to this shaft 6, carry the cutting head 9 and a bracket 10, to hold a core 11.

In the example illustrated, the bracket 10 for the core 11 consists of a forked member, of which one prong, 12, can be moved in a direction parallel to the other prong 13, by means of a. ram cylinder 14. If, for example, the prong 12 is lowered towards the guide drum 3, the core 11 is brought into contact with the latter, and vice versa (FIGURE 3).

In FIGURE 2, an electro-magnetic coupling 15 is shown which serves to couple the pair of swing levers 8 to the guide drum 3 when the hydraulic motor 7 is cut out. Thus, when the electro-magnetic coupling 15 is energized the pair of swing levers 8 follow the rotary motion of the guide drum 3.

FIGURES 4 and 5 show the roll mounting means. This consists of a pair of pivoted arms 16, which can be swung from the winding position to a discharge position by a hydraulic motor 17. These two pivoted arms 16 are mounted on a slide 18, operated by a double-acting ram 19. The purpose of this ram 19 is to ensure that the roll, while in the winding position, is held against the guide drum 3, to provide the friction drive that is essential to the winding action. This ram 19 also serves to move the two pivoted arms 16 to the discharge position (full lines in FIGURE 1).

The pivotal arms 16 acting as the roll mounting means lave a catch 16a, which is released with the aid of the "am 16b before the partially wound roll is taken over tnd before the roll is discharged to the storage container )r the like.

The cutting head consists essentially of a cutter car- 'iage 20 (FIGURE 7), which is attached to the nut 21 FIGURE 7), forming one member of a screw-threaded lrive, this nut 21 being arranged to travel along a screwhreaded spindle 22. When a hydraulic motor 23 is op- :rated, the screw-threaded spindle 22 is rotated, this roary action being converted into translational motion imarted to the cutter carriage 20. On completion of the :ut, the direction of rotation of the hydraulic motor 23 s reversed, with the result that the cutter carriage 20 is 'eturned to its starting position. Suitable means, such as tops or the like, are provided, whereby the cutter on he carriage 20 is slightly raised during this return movement and thus is out of contact with the foil 1.

In FIGURE 1, a core magazine 24 is shown pivoted that it can rock about a fulcrum 25. When a core 11 tas been laid in the brackets 10, the core magazine 24 s swung upwards out of its operative position, This swing LCtlOIl is imparted by a hydraulic ram 26. The core magazine 24 is provided with a catch 27, which in the discharge vosition releases one core 11 at a time to the brackets .0 (FIGURE 1).

The mode of operation of the machine in accordance vith the invention is as follows:

As soon as the roll of material on a core mounted on he pivotal arms 16 has reached a pre-determined thickless, the hydraulic motor 7 is brought into action, by means of a control signal, and moves the swing levers 8 rom the magazine-discharge position marked I to the tart-of-cut position marked 11, the brackets 10 being tccupied by a core 11.

If an oblique cut is to be made in the material, the cuting head is operated by starting the hydraulic motor 23, 0 that the foil 1 is cut. While the cut is being made, the wing levers '8 remain stationary. On completion of the ut, the direction of rotation of the hydraulic motor 23 reversed, to raise the cutter and return it to its starting osition.

The movable prong 12 is then lowered towards the uide drum 3, so that the core 11, coated with adhesive, omes to bear against the foil 1 moving around the guide rum 3. By virtue of the friction drive between the guide rum 3 and the roll, a partial roll containing very few nm is formed.

If, on the other hand, a straight cut is desired, then, Iith the swing levers 8 in the start-of-cut position II FIG. 1), the electro-magnetic coupling 15 is switched n at the beginning of the movement of the cutter cariage 20, so that the swing levers 8, during the cutting ction move with the guide drum 3 until it reaches the ragazine-discharge position I. The cutter itself is thus ound to follow an oblique path. When position I is eached, the electro-magnetic coupling is switched off. .1 other respects, the mode of operation is the same as 'ith oblique cuts.

It is also possible with a machine in accordance with re invention to make a combined oblique and straight ut. To do this, the procedure for oblique cutting is fol- )wed initially; then, when an oblique cut of pre-deterlined length has been made, the electro-magnetic couling 15 is switched on to produce a straight cut, so that re swing levers 8, during this part of the cutting action )llow the motion of the guide drum 3 to the magazineischarge position I.

Following the formation of the partially wound roll, 1e swing levers 8 are moved by the hydraulic motor 7 the winding position, marked III (FIG. 1). The catch 6a is then opened by the ram 16b and the partially 'ound roll is deposited in the roll mounting means. The atch 16a then closes again and the partial roll has more taterial wound on to it until the desired roll thickness is reached. The swing levers 8 are then returned to the magazine-discharge position I.

When the roll has acquired the requisite thickness, the hydraulic motor 17 moves-the pivotal arms 16 to the horizontal position. At the same time, the roll mounting means is moved by the double-actingram 19 to the discharge position. Then the catch 16a is opened, to enable the roll to be discharged into astorage container or the like, the roll mounting thereupon being moved back to the winding position III.

The depositing of the cores 11 in the brackets 10 proceeds as follows:

Firstly, the core magazine 24 is swung by the ram 26 to the position shown in FIGURE 1, Then, likewise by hydraulic or pneumatic means, the catch 27 is released to enable the foremost core 11 in the row of cores to drop by force of gravity into the brackets 12. The catch 27 is then closed and the core magazine swung upwards out of action.

With the mechanism here proposed, the Winding, cutting and discharging actions are fully automatic, the guide drum 3 being so constructed that the run of foil 1 is at all times properly guided, ensuring that creases cannot form.

I claim:

1. In a machine for continuously winding sheet material on to a core,

a core magazine,

a cutting head for cutting the sheet material, and

means for discharging a wound core from the machine,

the improvement comprising means defining a guide drum around which sheet material to be wound is passed,

a pair of swing levers co-axial with the guide drum and each carrying bracket means for supporting the core, and

means for moving the swing levers selectively either with the guide drum or separately between positions at which a core is received from the core magazine, a position at which the cutting head comes into operation to cut the sheet material and a position at which winding can take place, said cutting head being carried by said swing levers.

2. A machine according to claim 1, comprising an electro-magnetic coupling for coupling the swing levers and the, guide drum.

3. A machine according to claim 1, wherein said means for moving the swing levers includes a hydraulic motor.

4. A machine according to claini 1 wherein each said bracket means comprises a pair of prongs and means for moving one said prong in a direction parallel to the longitudinal orientation of the other prong.

5. A machine according to claim 4, wherein said prong moving means comprises a hydraulic piston and cylinder assembly.

6. A machine according to claim 4, comprising means for controlling the movable prong to allow reception of a said core in the position for receiving a said core from the magazine to bear against the guide drum in such a way that, following the cutting action, the core can be partially wound with said sheet material.

7. A machine according to claim 6, wherein said control means serve to actuate the two swing levers to move the partially wound core from the position for receiving a core from the magazine to the winding position.

8. A machine according to claim 7, further comprising roll mounting means having a catch which is releasable prior to the partially wound roll being taken over and before the roll is discharged.

9. A machine according to claim 8, wherein the roll mounting means is coupled to a double-acting ram which serves to press the roll against the guide drum and serves to move the roll mounting means selectively to the discharge position and winding position.

10. A machine according to claim 1, wherein the cutting References Cited head includes a cutter carriage and a screw-thread drive UNITED STATES PATENTS means, said screw-thread drive means serving to return the carriage to the starting position after completing a cut. 3,087,687 5/1963 Grettve 242 56 11. A machine according to claim 1, comprising pivot 3,167,268 1/ 1965 Birch et al. 24256 means mounting the core magazine said magazine being 5 3 2 2 524 11 19 Couzens et 1 242 5 pivotal after a core has been deposited in the bracket 3,411,732 11/1968 Ebneter 242 56 means to an alternative position.

12. A machine according to claim 11, including latch LEONARD D CHRISTI AN, Primary Examiner means on the core magazine, WhlCh latch means in the discharge position of the magazine releases one core at 10 A US. Cl. X.R. a time to the bracket means. 242 55.1, 65 

